OmniStream doxygen documentation added.

I started documenting the two new libraries, OmniStream [or OStream for brevity] and OmniStuff, that are coming out on Omnimeeting CVS [http://omnimeeting.cvs.sourceforge.net/omnimeeting/]. The docs are reachable here [http://omnimeeting.sourceforge.net/doc/index.html]. Expect more changes in the next hours/days.

Project web site: http://omnimeeting.sourceforge.net/
Project page: http://sourceforge.net/projects/omnimeeting

Massimo Cora'